Sheet-metal-polishing machine.



H. D. EUSTON.

SHEET METAL POLISHING MACHINE. APPLICATION FILED JUNE 25. I916.

Patented Jan. 15, 1918.

E O Q k Inventor;

\Aliiznessesr v 1 7W 7. Zmm- UNITED s AT'Es PATENT o' 'FIoE.

HARRY 1). EU s'roN, creamer, massaonvsnrrs.

snnnr-mnrltp-romsnme amounts.

To all whom it may concern:

Be it known that I, HARRY D. Ens'rox, a citizen of the United States, and a resident of Quincy, in the county of Norfolk and State of Massachusetts, have invented a new and useful Sheet-Metal-Polishing Machine, of which the following is a specificatiom My invention relates to a polishing machine wherein a drum covered'with felt, said felt being charged with a' suitable abrasive such as pumice, is rotated against a sheetmetal plate, said plate being backed up by an idler roll, and fed over the felt covered drum by two sets of feed rollers. These feed rollers and the idler roll have suitable means of adjustment by means of which the amount of pressure between idler and drum may be regulated and by means of which the distance between feed rolls can be chai ged to compensate for diflerent thicknesses of plates.

My invention particularly relates to a machine for polishing sheet copper such as used in the engraving art and is used preferably on plates which have been planished on my planishing machine, the details of which are substantially described in. a previous appli cation.

A com lete description of my polishing machine ollows, reference being made to the accompanying drawings of'which Figure 1 is a side elevation, Fig. 2- an end elevation, and Fig. 3a diagrammatic'section through the main cylinder showing the plate and the relative directions of action of the feed and idler'rolls, etc. I

The two side frames 1, having a door 1 to examine interior, are held together by four tie rods 2, holding between them a box like trough 3 of sheet iron, preferably alvanized, having a door 3 in the bottom or clean-out purposes, Inside this trough and held in position by suitable bearings in the frame, is the main polishing drum 4. This drum is driven by belting from a suitv able source of power by'the pulley 5.

Rotating at the same surface speed as the main drum i is a roll 6, having its outer surface serrated in an axial direction and being held in suitable bearings in the levers 7-7 which in turn are pivoted at one end in the'frames 11. and held by the tension springs 8 8. The end gudgeons on the roll pass through slots in the frames 1 1, said slotsbeing longenough to let the roll have Specification o1 Letters latent.

Application filed June 26, 1916. Serial No. 105,919.

Patented Jan. 15,1918.

springs 88 to hold the roll 6 against the drum 4. The roll 6 is driven from the main shaft by the sprockets 9 and 10 and the chain 1 On one end. of the main drive shaft is a worm 12 which drives the worm wheel 13 which is on a shaft held by suitable bearings cast integral with the frame 1, and has'on its upper end a bevel gear 14. This gear drives another bevel gear 15 which is mounted on the horizontal worm shaft 16 which is also held in suitable brackets cast integral with the frame.

Also mounted on the shaft 16 are the worms 17'17 which drive the worms 1818 which are mounted on the ends of the lower feed rolls 19=--19 and drive them.

hold the idler rolls *24 pressed against the main drum 4 by means of the springs 25,

the spring holder 26, the adjusting screws 27 and the lock-nuts 28.

In operating my polishing machine the main drum 4 is first covered with hard pol' ishing felt about 1} inch in thickness and then some suitable abrasive such, as pulverized pumice stone is placed in the ottom of the sheet metal trough 3. The

machine is started and the main drum revolves 1n the relative directlon shown by the diagrammatic section Fig. 3. The abrasive ispicked up by the longitudinal serrations in roll 6 and a suitable amount is pressed into) the felt covering on drum 4. This opera" tion'is seen to be continuous 'as long'as the machine is driven by pulley 5. \Vhen a plate is to be polished it is inserted into the machine through feed rolls 19" and 21'. and as y i the rolls 19 and 19 are driven through the worms, worm wheels and bevel gears reviously described, they' move the p ate toward the drum 4; In feeding the plate forwardit is caught between the drum 4 and idler roll 24' and with the springs 25 adjusted for the right pressure the abrasive action begins and continues until the entire length of plate has passed between the rolls.

a little vertical play andto allow the tensiom As the plates polished are always longer than the distance between the feed'rolls 19* and 21, and 19 and 21, other pairs ofrolls and therefore is-fed tating drum '4.

On some machines there is a piece'of steel 29 running from frames 1 across the machine havin on its u ersurface a stri g EP P of soft felt 30, the o ect "being to clean 'oif any minute particles of the abrasive that might tend to adhere to the plate 31, therefore preventin these'small particles from being rolled into the plate by the feed rolls 19 21. a

- It will'be-seen that as the drum 4 rotates evenl and that the feed is constant,

a plate po ished by this machine shows an evenly polished surface and is much superior to the hand bufied graving art.

What I claim as new is 1 In a sheet metal polishing machine, the

combination of a frame, a poweroperated 0691a 91 this patent my be obtlined tor positively past the roc plate used in'the enfeltcovered drum mounted on the frame, a serrated cylinder in axial relation to the drum, and driven simultaneously with it, a flexible support for a cylinder'which is held against the drum for charging it with an abrasive materia1,-a easing covering the drum and the cylinder the latter serving as a receptacle for the abrasive material, rolls for feeding the sheet metal over the polishin drum, suitable gears for operating the ro is which are driven by the main shaft, adj ustablerolls for holding the sheet metal in' position and which compensate for the varying thickness of the metal, a wi er secured to the frame for cleaning the a rasive" material toprevent it from the sheet metal plate.

HARRY D. E sToN.

grinding into Witnesses: WALTER S. TRACY,

ERNEST DAVIDSON.

five cents each, by addressing the Gcauniuibne'r 0! Patents,

Washington, D. 0." 

